Improvement in steam pumping-engines



W. G. HEISTER.

Steam Pumping Engine.

Patented June 4,1878.

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N.PE7ERs, FNDTOJJTHOGRAPNER. WASHINGTON, n C

UNITED" STATES PATENT OFFICE.

WILLIAM G. HEISTER, or SPRINGFIELD, OHIO.

IMPROVEMENT IN STEAM PUMPING-ENGINES.

Specification forming part of Letters Patent No. 204,433, dated June 4,1878; application filed April 27,1878.

To all whom it may concern.-

Be it known that 1, WILLIAM G. HEISTER, of Springfield, in the county ofClarke and State of Ohio, have invented certain new and usefulImprovements in Steam Pumping-Engines; and I do hereby declare thefollowing to be a full, clear, and exact description of the same.

The object of my invention is to increase the efficiency, durability,and economy of double direct-actin g steam pumping-engines 5 and myimprovements consist in the construction of the steam-valve andsteam-chest with double ports, for rendering the delivery and exhaustmore perfect and uniform; also, in the peculiar construction of thewater or pumping cylinders, all as will be herewith set forth andspecifically claimed.

In the accompanying drawings, Figure 1 represents a .Ian view of myimproved engine, with. one of the steam-cylinders shown in longitudinalsection. Fig. 2 is a side elevation of the same, with one of theWater-cylinders shown in central section. Figs. 3 and 4 are end views ofthe water-cylinder, which will be referred to farther on.

Corresponding letters of reference indicate like parts in all thefigures.

Upon any suitablyconstructed bed or frame, A, are mounted, at one end,two parallel adjacent steam-cylinders, B, of ordinary construction, and{provided with pistons and pistonrods 0 and D.

E is the balance-wheel, mounted upon a shaft, F, journaled inpillow-blocks G upon the bed, as shown. The axes of this shaft and ofthe piston-rods lie in the same plane.

Keyed on each side of the wheel E is a heart-shaped cam or eccentric, H,which cams are set quartering to each other. By means of these cams thebalance-wheel is rotated through the medium of cross-heads I, of theshape indicated. These latter travel in ways a upon the bed, and areslotted vertically to receive the cams H, which are confined inthem. Thepiston-rods G and D have their ends connected to each of thesecross-heads, as represented. The piston-rods J of the pumpingcylindersare also connected to the opposite ends of the cross-heads, so that thelatter form the means of connecting the two sets of pistonrods.

Pivoted in the slots of the cross-heads at each end, and in line withthe piston-rods, are friction-rollers b, which, as the piston-rodsvibrate, bear against the cams H and cause their rotation. The object ofthese rollers is to prevent the wear of the parts and to diminishfriction.

The valve-rods K are operated by ordinary eccentrics, 0, upon the shaftF, and these eccentrics are likewise set quartering.

The steam-chest L (shown in section, Fig. 1) has opening from it intothe steam-cylinder two sets of ports, 0 f and g h, which converge andenter the cylinder at i and j.

The valve is composed of a rectangular frame, whose ends form slides m,that rest and travel upon the seat. This frame is adjustably fitted byset-screws upon the valve-rod, as shown. Between these outer slides, andwithin the frame, is the ordinary bridge-piece k, covering theeduction-port Z. This piece is loose upon the valve-rod, so as to obtainlost motion, and it is shifted by each of the slides m alternately. Bythis construction and arran gement steam can be cut off at any portionof the stroke, and the expansion can be retained until the completion ofthe stroke, if desired.

By reference to Figs. 3 and 4, the construction of the pumping-cylinderscan be clearly seen. M is the central cylinder, in which the pistondriven by the rod J works. Above and below this cylinder are chambers NN, in the former of which is the induction-port, and in the latter theeduction-port, communicating with the air-chamber.

The cylinder-heads P are recessed, as seen in section, Fig. 2; andrecesses B are formed at each end of the chambers N N, separated byflanges a, as seen in Fig. 3.

S S are disks, which divide the recesses B from the recesses in thecylinder-heads P at each end. The disks have apertures coincident withthe bore of the cylinder M, as seen in Fig. 4.

In each of the disks S are two sets of valves,

t 1. These valves are formed by making segmental apertures b in thedisks, which apertures are covered by rubber or other yielding disks 0,which are held to their seats by spiral springs coiled upon centralstuds 01, projecting from the disks S, as shown. The lower of these setsof valves, 1, open into the recesses of the cylinder-heads P, while theupper sets open into the recesses R, which communicate With the chamberN.

Now, as the piston vibrates in the cylinder M, water is first drawnthrough the valves t into the recesses of the heads P, and is thenforced through the valves t into the chamber N, and thence into theair-chamber. By this arrangement all danger of back-pressure is avoidedand greater power can be exerted.

While I have described my invention in its application to a doublepumping-engine, still the same devices could be applied equally as wellto a single pump, the advantage in a double pump of this constructionbeing the impossibility of halting on a dead-center.

Having thus fully described my invention, 1 claim- 1. Theherein-described slide-valve, consisting of the loose bridge is andadjustable slides m, in combination with the induction and eductionports, whereby the steam can be cut ofl' automatically at any desiredpart of the stroke, and wher by the expansii e force of the steam may beretained until the completion of the stroke, substantially as specified.

2. The herein-described pumping-cylinder, consisting of the centralcylinder M, recessed heads P, valve-disks S, with their sets of valvestt, the upper seated on the inner and the lower on the outer faces ofthe disks S, recesses R, and chambers N N, the whole constructed andarranged in the manner andfor the purpose specified.

Witness my hand this 16th day of April, A. I). 1878.

WILLIAM C. HEISTER.

Witnesses:

GEO. S. RIZER, J osEPH KELLEY.

